46295 + Interview Questions in Chemistry

1.	The maximum possible number of hydrogen bonds in which a water molecule can participate is :
Answer» The maximum possible number of hydrogen bonds in which a water molecule can participate is :

Discussion

2.	Ethyl alcohol on oxidation with acidified potassium permanganate gives:
Answer» Ethyl alcohol on oxidation with acidified potassium permanganate gives:

Discussion

3.	An element crystallizes in fcc lattice with a cell edge of 300 pm. The density of the element is 10.8 gcm−3. Calculate the number of atoms in 108 g of the element.
Answer» An element crystallizes in fcc lattice with a cell edge of 300 pm. The density of the element is $10.8 g c m^{- 3}$ . Calculate the number of atoms in 108 g of the element.

Discussion

4.	Total sum of α−H in major product(s) (alkene) of each of the following reactions.
Answer» Total sum of $α - H$ in major product(s) (alkene) of each of the following reactions.

Discussion

5.	What are secondary alcohols?
Answer» What are secondary alcohols?

Discussion

6.	Isoelectric point is a
Answer» Isoelectric point is a

Discussion

7.	An acidified solution of KMnO4 oxidizes
Answer» An acidified solution of $K M n O_{4}$ oxidizes

Discussion

8.	Which of the following molecule(s) is/are planar?
Answer» Which of the following molecule(s) is/are planar?

Discussion

9.	The reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional groups?
Answer» The reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional groups?

Discussion

10.	Green chemistry means such reactions which:
Answer» Green chemistry means such reactions which:

Discussion

11.	Why does addition of inert gas at constant volume not affect equilibrium of system but addition of inert gas at constant pressure does affect it?
Answer» Why does addition of inert gas at constant volume not affect equilibrium of system but addition of inert gas at constant pressure does affect it?

Discussion

12.	Kc for the reaction, Fe2++Zn→Zn2++Fe is 1023, The standard free energy change is
Answer» $K_{c}$ for the reaction, $F e^{2 +} + Z n \to Z n^{2 +} + F e$ is $10^{23}$ , The standard free energy change is

Discussion

13.	A ring shaped tube contains two ideal gases with equal masses and molar masses M1=32 and M2=28. The gases are separated by one fixed partition and another movable stopper S which can move freely without friction inside the ring. Both the partitions are thermally conducting. The angle α as shown in the figure is degrees.
Answer» A ring shaped tube contains two ideal gases with equal masses and molar masses $M_{1} = 32$ and $M_{2} = 28.$ The gases are separated by one fixed partition and another movable stopper S which can move freely without friction inside the ring. Both the partitions are thermally conducting. The angle $α$ as shown in the figure is degrees.

Discussion

14.	Which of the following metal carbides may be called a methanide?
Answer» Which of the following metal carbides may be called a methanide?

Discussion

15.	QUESTION 2.20 A 5% solution (by mass) of cane sugar in water has freezing point 271 K. Calculate freezing point of 5% glucose in water if freezing point of pure water is 273.15K.
Answer» QUESTION 2.20 A $5 %$ solution (by mass) of cane sugar in water has freezing point 271 K. Calculate freezing point of $5 %$ glucose in water if freezing point of pure water is 273.15K.

15.

QUESTION 2.20 A 5% solution (by mass) of cane sugar in water has freezing point 271 K. Calculate freezing point of 5% glucose in water if freezing point of pure water is 273.15K.

Answer»

QUESTION 2.20

A $5 %$ solution (by mass) of cane sugar in water has freezing point 271 K. Calculate freezing point of $5 %$ glucose in water if freezing point of pure water is 273.15K.

Discussion

16.	A member of the lanthanoid series which is well known to exhibit +4 oxidation state is:
Answer» A member of the lanthanoid series which is well known to exhibit +4 oxidation state is:

Discussion

17.	For which of the following reactions, the entropy change will be positive?
Answer» For which of the following reactions, the entropy change will be positive?

Discussion

18.	One mole of acetone requires less heat to vaporise than 1 mole of water. Which of the two liquids has higher enthalpy of vaporisation?
Answer» One mole of acetone requires less heat to vaporise than 1 mole of water. Which of the two liquids has higher enthalpy of vaporisation?

Discussion

19.	The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at Ph = 7.0? ___
Answer» The substituents R₁ and R₂ for nine peptides are listed in the table given below. How many of these peptides are positively charged at Ph = 7.0? ___

Discussion

20.	Solubility product Ksp of a sparingly soluble salt Zn(CN)2 is 8×10−12. Its solubility value in (mol L−1) is: (Take 3√2=1.26)
Answer» Solubility product $K_{s p}$ of a sparingly soluble salt $Z n (C N)_{2}$ is $8 \times 10^{- 12} .$ Its solubility value in $(m o l L^{- 1})$ is: (Take $\sqrt[3]{2} = 1.26$ )

Discussion

21.	How does an alkaline medium inhibit corrosion?
Answer» How does an alkaline medium inhibit corrosion?

Discussion

22.	What is the variation in valency of the elements along a period?
Answer» What is the variation in valency of the elements along a period?

Discussion

23.	The polarizing power of magnesium is nearly same as
Answer» The polarizing power of magnesium is nearly same as

Discussion

24.	The molarity of urea (molar mass 60 g mol−1) solution by dissolving 15 g of urea in 500 cm3 of water is:
Answer» The molarity of urea (molar mass 60 g $m o l^{- 1})$ solution by dissolving 15 g of urea in 500 $c m^{3}$ of water is:

Discussion

25.	The number of hydroxyl groups present in a sample of 1.8 g of α -D - Glucose are
Answer» The number of hydroxyl groups present in a sample of 1.8 g of α -D - Glucose are

Discussion

26.	The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because:
Answer» The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because:

Discussion

27.	Among the following nitrates, Lead nitrate, Silver nitrate and Ammonium nitrate; the one that decomposes without leaving any solid residue is
Answer» Among the following nitrates, Lead nitrate, Silver nitrate and Ammonium nitrate; the one that decomposes without leaving any solid residue is

Discussion

28.	Which of the following molecules is least resonance stabilized ?
Answer» Which of the following molecules is least resonance stabilized ?

Discussion

29.	3LiBH4+3NH4Cl→′P′+3LiCl+9H2 One mole of 'P' reacts with 3 moles of HCl to form a compound Q. How many hydrogen atoms are attached to nitrogen atoms in one molecule of Q?
Answer» $3 L i B H_{4} + 3 N H_{4} C l \to^{'} P^{'} + 3 L i C l + 9 H_{2}$ One mole of 'P' reacts with 3 moles of HCl to form a compound Q. How many hydrogen atoms are attached to nitrogen atoms in one molecule of Q?

Discussion

30.	Why do noble gases have comparatively large atomic sizes?
Answer» Why do noble gases have comparatively large atomic sizes?

Discussion

31.	Which of the following acts as the strongest conjugate base?
Answer» Which of the following acts as the strongest conjugate base?

Discussion

32.	What is meant by the heat of hydrogenation?
Answer» What is meant by the heat of hydrogenation?

Discussion

33.	n X+n HOOC−Ph−COOH−−−−−−−−−−→polycondensationTerylene ′X′ is:
Answer» $n X + n H O O C - P h - C O O H - --------- \to polycondensation Terylene$ $^{'} X^{'}$ is:

Discussion

34.	40 mL gaseous mixture of CO, CH4 and Ne was exploded with 20 mL of oxygen. On cooling, the gases occupied 46.5 mL. After treatment with KOH, the volume reduced by 9mL and again on treatment with alkaline pyrogallol, the volume gets further reduced. Percentage of CH4 in the original mixture is.
Answer» $40 m L$ gaseous mixture of $C O, C H_{4}$ and $N e$ was exploded with $20 m L$ of oxygen. On cooling, the gases occupied $46.5 m L$ . After treatment with $K O H$ , the volume reduced by $9 m L$ and again on treatment with alkaline pyrogallol, the volume gets further reduced. Percentage of $C H_{4}$ in the original mixture is.

Discussion

35.	The e.m.f of a Daniell cell at 298 K is E1 Zn\|ZnSO4(0.01 M)\|\|CuSO4(1.0 M)\|Cu When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f changed to E2. What is the relationship between E1 and E2?
Answer» The e.m.f of a Daniell cell at $298 K$ is $E_{1}$ $Z n \| Z n S O_{4} (0.01 M) \| \| C u S O_{4} (1.0 M) \| C u$ When the concentration of $Z n S O_{4}$ is $1.0 M$ and that of $C u S O_{4}$ is $0.01 M$ , the e.m.f changed to $E_{2}$ . What is the relationship between $E_{1}$ and $E_{2}$ ?

Discussion

36.	We all know that light is a electromagnetic wave. I.e electric and magnetic effect but how can sunlight be em waves.( I know that light have dual nature but to this question it isn't making a sense) plz go very deep I want to understand it deeply Thanks a lot for your attention.
Answer» We all know that light is a electromagnetic wave. I.e electric and magnetic effect but how can sunlight be em waves.( I know that light have dual nature but to this question it isn't making a sense) plz go very deep I want to understand it deeply Thanks a lot for your attention.

36.

We all know that light is a electromagnetic wave. I.e electric and magnetic effect but how can sunlight be em waves.( I know that light have dual nature but to this question it isn't making a sense) plz go very deep I want to understand it deeply Thanks a lot for your attention.

Answer»

We all know that light is a electromagnetic wave. I.e electric and magnetic effect but how can sunlight be em waves.( I know that light have dual nature but to this question it isn't making a sense) plz go very deep I want to understand it deeply

Thanks a lot for your attention.

Discussion

37.	A solid which floats in H2O, sinks in D2O. Why?
Answer» A solid which floats in $H_{2} O$ , sinks in $D_{2} O$ . Why?

Discussion

38.	For a reaction Mx++MnO−4→MO−3+Mn2++12O2 If 1 mole of MnO−4 oxidises 1.66 moles of Mx+ to MO−3, then the value of x in the reaction is
Answer» For a reaction $M^{x +} + M n O_{4}^{-} \to M O_{3}^{-} + M n^{2 +} + \frac{1}{2} O_{2}$ If 1 mole of $M n O_{4}^{-}$ oxidises 1.66 moles of $M^{x +}$ to $M O_{3}^{-}$ , then the value of x in the reaction is

Discussion

39.	Calculate the fractional charge on Bromine atom in HBr. Given dipole moment of HBr = 0.78 D, bond distance of HBr = 1.41∘A, electronic charge e = 4.8×10−10 e.s.u
Answer» Calculate the fractional charge on Bromine atom in HBr. Given dipole moment of HBr = 0.78 D, bond distance of HBr = $1.41 \circ A$ , electronic charge e = $4.8 \times 10^{- 10}$ e.s.u

Discussion

40.	Match the items in column I with their respective values in column II. 1. According to Bohr's thoery En = Total energy Kn = Kinetic energy Vn = Potential energy rn = Radius of nth orbit energy Column IColumn IIa.VnKn=?p.0b.If radius ofnthorbit∝Exn,x=?q.−1c.Angular momentum in lowest orbitalr.−2d.1rn∝Zy,y=?s.1
Answer» Match the items in column I with their respective values in column II. 1. According to Bohr's thoery $E_{n}$ = Total energy $K_{n}$ = Kinetic energy $V_{n}$ = Potential energy $r_{n}$ = Radius of nth orbit energy $\begin{matrix} Column I & Column II a . \frac{V_{n}}{K_{n}} = ? & p . 0 b . If radius of n^{t h} orbit \propto E_{n}^{x}, x = ? & q . - 1 c . Angular momentum in lowest orbital & r . - 2 d . \frac{1}{r_{n}} \propto Z^{y}, y = ? & s .1 \end{matrix}$

40.

Match the items in column I with their respective values in column II. 1. According to Bohr's thoery En = Total energy Kn = Kinetic energy Vn = Potential energy rn = Radius of nth orbit energy Column IColumn IIa.VnKn=?p.0b.If radius ofnthorbit∝Exn,x=?q.−1c.Angular momentum in lowest orbitalr.−2d.1rn∝Zy,y=?s.1

Answer»

Match the items in column I with their respective values in column II.
1. According to Bohr's thoery
$E_{n}$ = Total energy
$K_{n}$ = Kinetic energy
$V_{n}$ = Potential energy
$r_{n}$ = Radius of nth orbit energy

$\begin{matrix} Column I & Column II a . \frac{V_{n}}{K_{n}} = ? & p . 0 b . If radius of n^{t h} orbit \propto E_{n}^{x}, x = ? & q . - 1 c . Angular momentum in lowest orbital & r . - 2 d . \frac{1}{r_{n}} \propto Z^{y}, y = ? & s .1 \end{matrix}$

Discussion

41.	The ionic conductance of which of the following is the highest?
Answer» The ionic conductance of which of the following is the highest?

Discussion

42.	1.84 g of a mixture of CaCO3 and MgCO3 was heated to a constant weight. The constant weight of the residue was found to be 0.96 g. calculate the percentage composition of the mixture.. (Ca=40,Mg=24,C=12,O=16)
Answer» 1.84 g of a mixture of $C a C O_{3}$ and $M g C O_{3}$ was heated to a constant weight. The constant weight of the residue was found to be 0.96 g. calculate the percentage composition of the mixture.. $(C a = 40, M g = 24, C = 12, O = 16)$

Discussion

43.	Predict the correct order of replusion among the following
Answer» Predict the correct order of replusion among the following

Discussion

44.	Consider an isothermal reversible compression of 1 mole of an ideal gas in which pressure of the system increased from 5 atm to 30 atm at 300 K. The entropy change (in kJ) of the surrounding is: (R=8.314 Jmol−1K−1)
Answer» Consider an isothermal reversible compression of 1 mole of an ideal gas in which pressure of the system increased from 5 atm to 30 atm at 300 K. The entropy change (in kJ) of the surrounding is: ( $R = 8.314 J m o l^{- 1} K^{- 1}$ )

Discussion

45.	Which has maximum boiling point
Answer» Which has maximum boiling point

Discussion

46.	What is the order of preference of stability of carbocation.
Answer» What is the order of preference of stability of carbocation.

Discussion

47.	The sum of the unpaired electrons of Ni2+ in octahedral and tetrahedral field is:
Answer» The sum of the unpaired electrons of $N i^{2 +}$ in octahedral and tetrahedral field is:

Discussion

48.	If electronegativity difference between atoms is 2.0, the % ionic character of the molecule is
Answer» If electronegativity difference between atoms is 2.0, the % ionic character of the molecule is

Discussion

49.	Maximum covalent character is associated with the compound
Answer» Maximum covalent character is associated with the compound

49.

Maximum covalent character is associated with the compound

Answer»

Maximum covalent character is associated with the compound

Discussion

50.	Assertion (A): In addition if HBr to propene, isopropyl bromide is major product but n - propyl bromide is minor product Reason(R): Isopropyl carbonium ion is more stable than n - propyl carbonium ion
Answer» Assertion (A): In addition if HBr to propene, isopropyl bromide is major product but n - propyl bromide is minor product Reason(R): Isopropyl carbonium ion is more stable than n - propyl carbonium ion

50.

Assertion (A): In addition if HBr to propene, isopropyl bromide is major product but n - propyl bromide is minor product Reason(R): Isopropyl carbonium ion is more stable than n - propyl carbonium ion

Answer»

Assertion (A): In addition if HBr to propene, isopropyl bromide is major

product but n - propyl bromide is minor product

Reason(R): Isopropyl carbonium ion is more stable than n - propyl carbonium ion

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The maximum possible number of hydrogen bonds in which a water molecule can participate is :

Ethyl alcohol on oxidation with acidified potassium permanganate gives:

An element crystallizes in fcc lattice with a cell edge of 300 pm. The density of the element is 10.8 gcm−3. Calculate the number of atoms in 108 g of the element.

Total sum of α−H in major product(s) (alkene) of each of the following reactions.

What are secondary alcohols?

Isoelectric point is a

An acidified solution of KMnO4 oxidizes

Which of the following molecule(s) is/are planar?

The reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional groups?

Green chemistry means such reactions which:

Why does addition of inert gas at constant volume not affect equilibrium of system but addition of inert gas at constant pressure does affect it?

Kc for the reaction, Fe2++Zn→Zn2++Fe is 1023, The standard free energy change is

Which of the following metal carbides may be called a methanide?

QUESTION 2.20 A 5% solution (by mass) of cane sugar in water has freezing point 271 K. Calculate freezing point of 5% glucose in water if freezing point of pure water is 273.15K.

A member of the lanthanoid series which is well known to exhibit +4 oxidation state is:

For which of the following reactions, the entropy change will be positive?

One mole of acetone requires less heat to vaporise than 1 mole of water. Which of the two liquids has higher enthalpy of vaporisation?

The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at Ph = 7.0? ___

Solubility product Ksp of a sparingly soluble salt Zn(CN)2 is 8×10−12. Its solubility value in (mol L−1) is: (Take 3√2=1.26)

How does an alkaline medium inhibit corrosion?

What is the variation in valency of the elements along a period?

The polarizing power of magnesium is nearly same as

The molarity of urea (molar mass 60 g mol−1) solution by dissolving 15 g of urea in 500 cm3 of water is:

The number of hydroxyl groups present in a sample of 1.8 g of α -D - Glucose are

The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because:

Among the following nitrates, Lead nitrate, Silver nitrate and Ammonium nitrate; the one that decomposes without leaving any solid residue is

Which of the following molecules is least resonance stabilized ?

3LiBH4+3NH4Cl→′P′+3LiCl+9H2 One mole of 'P' reacts with 3 moles of HCl to form a compound Q. How many hydrogen atoms are attached to nitrogen atoms in one molecule of Q?

Why do noble gases have comparatively large atomic sizes?

Which of the following acts as the strongest conjugate base?

What is meant by the heat of hydrogenation?

n X+n HOOC−Ph−COOH−−−−−−−−−−→polycondensationTerylene ′X′ is:

40 mL gaseous mixture of CO, CH4 and Ne was exploded with 20 mL of oxygen. On cooling, the gases occupied 46.5 mL. After treatment with KOH, the volume reduced by 9mL and again on treatment with alkaline pyrogallol, the volume gets further reduced. Percentage of CH4 in the original mixture is.

The e.m.f of a Daniell cell at 298 K is E1 Zn|ZnSO4(0.01 M)||CuSO4(1.0 M)|Cu When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f changed to E2. What is the relationship between E1 and E2?

We all know that light is a electromagnetic wave. I.e electric and magnetic effect but how can sunlight be em waves.( I know that light have dual nature but to this question it isn't making a sense) plz go very deep I want to understand it deeply Thanks a lot for your attention.

A solid which floats in H2O, sinks in D2O. Why?

For a reaction Mx++MnO−4→MO−3+Mn2++12O2 If 1 mole of MnO−4 oxidises 1.66 moles of Mx+ to MO−3, then the value of x in the reaction is

Calculate the fractional charge on Bromine atom in HBr. Given dipole moment of HBr = 0.78 D, bond distance of HBr = 1.41∘A, electronic charge e = 4.8×10−10 e.s.u

The ionic conductance of which of the following is the highest?

1.84 g of a mixture of CaCO3 and MgCO3 was heated to a constant weight. The constant weight of the residue was found to be 0.96 g. calculate the percentage composition of the mixture.. (Ca=40,Mg=24,C=12,O=16)

Predict the correct order of replusion among the following

Consider an isothermal reversible compression of 1 mole of an ideal gas in which pressure of the system increased from 5 atm to 30 atm at 300 K. The entropy change (in kJ) of the surrounding is: (R=8.314 Jmol−1K−1)

Which has maximum boiling point

What is the order of preference of stability of carbocation.

The sum of the unpaired electrons of Ni2+ in octahedral and tetrahedral field is:

If electronegativity difference between atoms is 2.0, the % ionic character of the molecule is

Maximum covalent character is associated with the compound

Assertion (A): In addition if HBr to propene, isopropyl bromide is major product but n - propyl bromide is minor product Reason(R): Isopropyl carbonium ion is more stable than n - propyl carbonium ion